I did the Minute Men solution to the Institute situation. Sturges took Shaun to the Castle, and the game will not let me move him to Sanctuary because I've already moved "too many" people there (Sanctuary is dark on the "move to" list.)
Shaun should be an exception to whatever programming rule is in place about this. He is my "son" and I should be able to send him to whichever community I desire. Bethesda, please fix this. I don't want to
"live" at the Castle.